Over a two-month period, this developer contributed to the postgres/postgres and pgsql-jp/jpug-doc repositories, focusing on release engineering, code quality, and documentation alignment. They upgraded PostgreSQL versioning from 19devel to 20devel, updating configuration files, build scripts, and documentation to support new development cycles. Their work included code formatting standardization using C and Perl tooling, as well as maintaining author attribution through git-blame-ignore-revs adjustments. In pgsql-jp/jpug-doc, they prepared the REL_18_STABLE branch for beta release by renumbering OIDs and improving test suite reliability, ensuring data integrity and smoother transitions between development stages.